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GPRS EDGE PARAMETER OPTIMIZATION
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www.huawei.com
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
GPRS/EDGE Radio Network Optimization Parameters
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page1
Foreword The PCU performance parameters are essential to the
GPRS/EDGE network. Proper setting of such parameters can improve performance of the packet services.
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page2
Contents1. GPRS/EDGE Cell Parameters
2. GPRS/EDGE Power Control
3. GPRS/EDGE Cell Reselection
4. GPRS/EDGE Performance Parameters
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page3
GPRS/EDGE Cell Parameters
NOM T3168 T3192 DRX_TIMER_MAX BS_CV_MAX
PAN N3101 N3103 N3105
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page4
Network Operation Mode (Paging Co-Ordination)
Network Mode
ConfigureGs
Configure PCCH
CS paging Message
PS Paging Message Idle Mode
Packet Dedicated
Mod
I Yes YesPPCH PPCH
PCCCHOr CCCH
PACCHPCH PCHPACCH -
I I No No PCH PCH CCCH CCCH
I I I No YesPCH PPCH
CCCH CCCHPCH PCH
Paging co-ordination means that the network sends CS paging messages on the PS channel, i.e., on the GPRS/EDGE paging channel or on the GPRS/EDGE traffic channel, so the MS needs only to monitor that channel.
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page5
See the notes!
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
NOM
BSC-level
Cell-level
Data Configuration of Paging Co-Ordination
Page6
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page7
T3168 T3168 is used to set the maximum duration for the
MS to wait for the packet uplink assignment message PCU
Packet Channel Request
Immediate Assignment Command
Packet Resource Request
Condiction BLER T3168 recommendationmsVery Good BLER
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page8
MS PCU
Packet Uplink Assignment
Uplink Data Block
Downlink Data Block
Packet Downlink Ack/NACK (channel request description)
Uplink Data Block
Uplink Data Block
UL TBF Establishment during DL Data Transmission
T3168
T3168
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Data Configuration of T3168
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page10
T3192 The timer is for the MS to wait for TBF release after receiving
the last data block.
PCU
T3192
Packet Downlink Ack/NackFAI=1
PACKET DOWNLINK ASSIGNMENTTFI
Final ACKIdentifier
Downlink Data Block (FBI1)Downlink Data Block
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration of T3192
Page11
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page12
DRX_TIMER_MAX The MS request keeps the maximum value of non-DRX
mode.
Packet transmission mode
Non_DRX DRX
Packet idle mode
Non_DRX
DRX_TIMER_MAX (s)
ValueSencond 0 1 2 4 8 16 32 64
Packet idle mode
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page13
See the notes!
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration of DRX_TIMER_MAX
Page14
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page15
Packet Signaling Processing
Packet Downlink Ack/NackFAI=1
T3192=500ms
Non DRX mode= 4s
DRX mode
DRX mode
Ready Mode
Downlink Data Block
Downlink Data Block (FBI)
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page16
BS_CV_MAX The mobile station shall send the Countdown Value (CV)
in each uplink RLC data block to indicate the current number of remaining RLC data blocks for the uplink TBF
The CV shall be calculated as follows:
.,15,__,
,then
.
1integer Let
otherwiseMAXCVBSxifx
CV
KNTSNBSTBC
roundx
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page17
Examples of CV Procedure(1)BSN CV
139 15
140 14
141 13
142 12
143 11
144 10
145 9
146 8
147 7
148 6
149 5
150 4
151 3
152 2
153 1
154 0
BSN CV
139 15
140 15
141 15
142 15
143 15
144 15
145 15
146 15
147 15
148 6
149 5
150 4
151 3
152 2
153 1
154 0
TBC= 155NTS=1BS_CV_MAX=15
TBC= 155NTS=1BS_CV_MAX=6
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page18
Examples of CV Procedure(2)TS0 TS1 TS2
BSN CV BSN CV BSN CV
125 15 126 15 127 15
128 15 129 15 130 15
131 15 132 15 133 15
134 15 135 15 136 6
137 6 138 6 139 5
140 5 141 5 142 4
143 4 144 4 145 3
146 3 147 3 148 2
149 5 150 5 151 5
152 4 153 4 154 4
155 3 156 3 157 3
158 2 159 2 160 2
161 1 162 1 163 1
164 0
TBC= 155NTS=3BS_CV_MAX=6
TBC= 155 ->165, because the channel coding scheme is changed
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration of BS_CV_MAX
Page19
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page20
PAN(Piggy-backed Ack/Nack ) PAN_DEC: Set the decrease step length of the N3102 counter of the MS PAN_INC: Set the increase step length of the N3102 counter of the MS PAN_MAX: Set the maximum value of the N3102 counter of the MS
Packet Uplink Ack/NackN3102
PAN_MAX
- PAN_DEC
+ PAN_INC
Abnormal Release
T3182
T3182
T3182 T3182
T3182
Perform Cell Re-selection
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page21
PAN(Piggy-backed Ack/Nack )PCU
N3102+2
Timeout
Suppose PAN_INC=2
T3182
Suppose PAN_DEC=1
N3102- 1
Uplink Data Block
Packet Uplink Ack/Nack
Uplink Data Block
Packet Uplink Ack/Nack
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration of PAN
Page22
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page23
N3101
PCU
Downlink Data Block /
Packet Uplink Assignment (valid USF)
N3101+1Uplink Data Block
Packet Polling Request
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page24
N3103
PCU
Packet Uplink Ack/Nack (FAI=1)
Packet Control Ack(or Access Burst 8bit)N3103+1
Uplink Data Block (CV=0)
Packet Uplink Ack/Nack (FAI=1)
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page25
N3105
PCU
Packet Downlink Ack/NackN3105+1
Downlink Data Block (RRBP)
Downlink Data Block (RRBP)
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration of N3101/3/5
Page26
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page27
Contents1. GPRS/EDGE Cell Parameters
2. GPRS/EDGE Power Control
3. GPRS/EDGE Cell Reselection
4. GPRS/EDGE Performance Parameters
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page28
GPRS/EDGE Power Control Purpose of GPRS/EDGE power control
Save the power Reduce the interference of the network
GPRS/EDGE power control is complex than GSM for discontinuous transmission
Normally now just uplink power control is implemented
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page29
GPRS/EDGE Power Control According GPRS/EDGE principle, GPRS/EDGE MS output power as below
Pch = Min (o - ch *( C+48) , Pmax) Pch: The PDCH output power in every independent uplink link, the unit is
dBm;
o: 39dBm for GSM 900, 36dBm for DCS1800 ch: Gamma, specified power control parameter for MS and the channel : Alpha, set by the network side. For open-loop power control, it is 1.0 C: the receiving signal level of MS Pmax: the maximum allowed transmit power for MS. If PBCCH exists, it is
GPRS/EDGE_MS_TXPWR_MAX_CCH; otherwise, it is MS_TXPWR_MAX_CCH.
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page30
GPRS/EDGE Power Control
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page31
Contents1. GPRS/EDGE Cell Parameters
2. GPRS/EDGE Power Control
3. GPRS/EDGE Cell Reselection
4. GPRS/EDGE Performance Parameters
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page32
GPRS/EDGE Cell Reselection During ready and standby mode, MS will occur cell reselection MS-controlled Cell reselection(also called autonomous cell reselection)
will be triggered upon the following 5 kinds of conditions
Current serving cell is prohibited Down link fails(DSC) C1servingcell
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GPRS/EDGE Cell Reselection If PBCCH no exists, the cell reselection is basically the same as GSM
cell reselection
When the two cells locates in the different routing areas or the MS is in READY mode, the C2N must be greater than C2S+CRH (>5s)
When the two cells locates in the same routing area and the MS is in STANDBY mode, the C2N must be greater than C2S (>5s)
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page34
Cell Reselection in Standby Mode
RA 1 RA 2
Cell A
Cell B
Cell C
C2A>C2B C2C>C2BCRH
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Cell Reselection in Ready Mode
C2B>C2ACRH
RA 1
Cell A Cell B
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Cell Reselection ModeNetwork Control Mode
NCM Definition Whether MS send the M.R MS Status
Cell Reselection Mode
NC0 Normal MS Control Mode NoReady & Standby Controlled by MS
NC1MS Control with M.R Mode
Yes Only Ready Controlled by MS
NC2 Network Control Mode Yes Only ReadyControlled by
network
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page37
Network Control Mode
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
In the NC2 mode and Ready state, the MS periodically sends packet measurement reports to the BSC. The BSC determines whether to perform cell reselection.
The NC2 feature supports Intra-BSC cell reselection Inter-BSC cell reselection GERAN-to-UTRAN cell reselection GERAN-to-EUTRAN cell reselection
Page38
Serving cell A
Neighbor cell B
Neighbor cell c
change to cell C
NC2 Feature
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Trigger Condition to NC2 Procedure In NC2 mode, any of the following events triggers a network-
controlled cell reselection. The MS signal strength keeps falling, and a neighboring cell with stronger signal
strength exists.
The MS signal quality keeps deteriorating, and a neighboring cell with better signal quality exists.
The serving cell of the MS is overloaded, and a neighboring cell with lighter load and stronger signal strength exists.
The SGSN indicates that the RAT(such as, GERAN, UTRAN, or EUTRAN) suitable for the MS is different from the current RAT.
In Standby state, the MS initiates autonomous cell reselection regardless of the NC mode.
Page39
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration of NC21. Run the BSC6900 MML command SET GCELLGPRS. In this step, set
the parameters as follows
Page40
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration of NC22. Run the BSC6900 MML command SET GCELLPSBASE.
Page41
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
In NC0/NC1 mode and packet transfer mode, the MS requests the SItargetcell from the BSC when performing cell reselection.
NACC is classified into Intra-BSC NACC Inter-BSC NACC UTRAN->GERAN NACC EUTRAN->GERAN NACC
Page42
NACC(Network Assisted Cell Change)
Cell A Cell B
System information of cell B
Serving CellTarget Cell
Begin
Serving cell supports NACC?
Target cell supports NACC?
BSC delivers system information of target
cell
End
Yes
Yes
No
No
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Trigger Condition to NACC Procedure The MS initiates the NACC procedure only when an autonomous cell
reselection is trigger
In NC0/NC1 mode and packet transfer mode, any of the following events triggers an NACC procedure
C1target cell C2servingcell Down link fails(DSC)
When in Standby status, MS performs the cell reselect by itself and does not initiate the NACC procedure
Page43
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Intra-BSC NACC Procedure
Page44
MS BSC
PACKET CELL CHANGE NOTIFICATION
PACKET NEIGHBOUR CELL DATA
PACKET CELL CHANGE CONTINUE
PACKET SI STATUS
PACKET SERVING CELL DATA
Obtain system messages of the target cell
Its optical according the data configuration PACKET SI(in the next slide)
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Inter-BSC NACC Procedure
Page45
MS Old BSC
PACKET CELL CHANGE NOTIFICATION
PACKET NEIGHBOUR CELL DATA
PACKET CELL CHANGE CONTINUE
PACKET SI STATUS
PACKET SERVING CELL DATA
Target BSC
RIM procedure
Obtain system messages of the target cell
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Activate intra-BSC NACC 1. Run the BSC6900 MML command SET GCELLPSBASE
2. Run the BSC6900 MML command SET GCELLGPRS
Data Configuration of NACC in Intra-BSC
Page46
Set to NC0(NC0) or NC1(NC1)
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.
Activate inter-BSC NACC 1. Run the BSC6900 MML command SET GCELLGPRS
2. Run the BSC6900 MML command MOD NSE
3. Run the BSC6900 MML command RST SIGBVC to activate RIM
Data Configuration of NACC in Inter-BSC
Page47Page47
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page48
Contents1. GPRS/EDGE Cell Parameters
2. GPRS/EDGE Power Control
3. GPRS/EDGE Cell Reselection
4. GPRS/EDGE Performance Parameters
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page49
Dynamic PDCH Channel Conversion When dynamic PDCH conversion will be triggered?
PDCH required failure (such as reach the max threshold) No meet the multiple timeslot The TBF numbers higher than Uplink (Downlink) Multiplex
Threshold of Dynamic Channel Conversion
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Dynamic PDCH Channel Conversion Which channel will be convert to dynamic PDCH
TCH/F channels can be converted to dynamic PDCH, the maximum dynamic PDCH number will be restricted by reasons listed below
The max PDCH number restricted by License Maximum Ratio Threshold of PDCHs in a Cell Maximum PDCH numbers of carrier Reservation Threshold of Dynamic Channel Conversion
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Dynamic PDCH Channel Conversion When the dynamic PDCH channel will be converted to
TCH channel? Timer of Releasing Idle dynamic Channel CS services preemption
All dynamic channels can be preempted Control channels cannot be preempted Dynamic channels carrying services cannot be preempted
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Dynamic PDCH Channel Conversion
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Dynamic PDCH Channel Conversion
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GPRS/EDGE Channel Priority Type
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GPRS/EDGE Channel Priority Type
TRX2
EGPRSNormal
EDGE MS GPRS/EDGE MS
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GPRS/EDGE Channel Priority Type
TRX2
EGPRSPriority
EDGE MS
reject
EGPRSPriority
GPRS/EDGE MSGPRS/EDGE
MS
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page57
GPRS/EDGE&EDGE Coding Scheme
8PSKGMSK
9.0513.4
15.6
21.4
8.811.2
14.817.6
22.4
29.6
44.8
54.4
59.2
0.00
10.00
20.00
30.00
40.00
50.00
60.00
CS-1 CS-3 CS-4 MCS-1 MCS-2 MCS-3 MCS-4 MCS-5 MCS-6 MCS-7 MCS-8 MCS-9
Kbps
GPRS
EDGE
CS-2
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Appendix
Codec
GPRS/ EDGE CS1 CS2 CS3 CS4
EDGE MCS1 MCS2 MCS3 MCS4 MCS5 MCS6 MCS7 MCS8 MCS9
I dl e Ti mesl ot 1+0 1+1 1+2 1+3
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page59
Appendix
Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page60
Summary In this course, we have learned:
The function of GPRS/EDGE cell parameters The function of GPRS/EDGE cell reselection parameters The function of GPRS/EDGE performance parameters
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